Basic maintenance of circular secondary clarifiers.

Bibliographic Details
Corporate Author:	Water Environment Federation
Format:	Book
Language:	English
Published:	[Alexandria, Va.] : Water Environment Federation, [1992?]
Subjects:	Sewage > Purification > Activated sludge process.

Description
Item Description:	At head of title : Problem-related operations-based education.
Physical Description:	vi, 44 pages : illustrations ; 28 cm.